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SCHROCK & FISCHER.

Pa tented Oct. 3,1846;

Clock. I

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2. Sheets-Sheet 2. SCHROCK & FISCHER. v

Clock.

Patented Oct. 3, 1846.

UNITED STATES PATENT OFFIOE.-

JOHN M. SHROGK, OF MILLERSBURG, OHIO, AND JOHN G. FISCHER, OF QUINCY,ILLINOIS.

CLOCK.

Specification of Letters Patent No. 4,791, dated October 8, 1846.

To all whom it may concern Be it known that we, JOHN M. SHRooK, ofMillersburg, in the county of Holmes and State of Ohio, and JOHN G.Fiscrrnn, of Quincy, in the county of Adams and State of Illinois, haveinvented certain new and useful Improvements in Clocks, and that thefollowing is a full, clear, and exact description of the principle orcharacter which distinguishes them from all other things before knownand of the manner of making, constructing, and using the same, referencebeing had to the accompanying drawings, making part of thisspecification, in which Figure 1 is a geometrical front view of theexterior of the clock, the face thereof being removed; Fig. 2, a frontview of the interior works; Fig. 3, an elevation of the pendulum, andFig. l, a plan of the same.

The same letters indicate like parts in all the figures.

The following description of our invention we shall render in threeparts; 1st the time keeping part; 2nd the pendulum; 3d the strikingpart.

The time keeping part consists of the main-wheel (a) of 144: teeth onone side of the clock, and which is furnished in the usual manner with aclick-spring, click and ratchet wheel, and on its arbor is the barrel,around which winds the cord to which the weight is attached. This wheelmeshes into a pinion (b) of 10 leaves on the arbor of the second wheelwhich has 120 teeth, and works in a ten leaf pinion (not seen ondrawing) on the center or index arbor (d). On the back of said secondwheel there are 15 lift-pins, by means of which the striking part isconnected with the time part. On the pinion and arbor ((Z) in which thesecond wheel meshes is the scape wheel (6) furnished with a dish formedplate (f) called the convex friction spring which serves in the usualway as is well known to clockmakers to prevent the derangement of thestriking part during the process of moving the hands. Somewhat below anda little on one side is an arbor which carries the anchor (g), which iswhat is known by the name of a dead-beat detached anchor. To the samearbor is attached the bob (h), and in opposition to the bob, and on theupper side of said arbor there is a counter balance (i), to keep the bobfrom falling back of its own accord. On the lower extremity of the bobthere is a hook-fork (j) for the purpose of throwing the bob out of theway of the upper collet of the pendulum hereafter described. On thesecond wheel arbor, in front of the front plate (Z), there is a wheel(m) of teeth, which moves the hour wheel (a) of l8 teeth. Attached tothe front plate (Z) by means of a screw is the bob guard (0) whichprevents the bob from swinging out too far. On the lower extremity ofthe bob, bending forward at a right angle is the crotch (p) from whichextends upward the above named hook-fork.

The rotary balance pendulum consists of the balance rim (6) and thecenter collet (1)) which are connected together by three wires (0) withscrew threads on which the regulating balls (CZ move. By advancing saidballs toward the center, the speed of the clock increases, and viceversa toward the rim. From the aforesaid center-collet rise two uprightpendulum wires (6), on the upper ends of which is placed another collet(f). This collet consists of a circular plate, on the top of which thereis a short cylinder of about half the diameter of the plate, and onefourth of which cylinder (opposite to where the impulse pin (9) isplaced) is longitudinally cut out in a quarto-circular manner so as toallow the crotch (p) to pass when acted upon by the said impulse pin.The two upright pendu lum wires are embraced by the slide (h), which ismade of two pieces and held together by means of two small screws. Thisslide has on one side a small flange (h) through which passes an uprightthumb screw (2) which moves it up and down, the lower extremity of saidscrew passes through the plate forming part of the center collet (6)below which it has a knob or head; this screw serves to regulate thespeed of the clock by shortening the spring (75,). By raising the slide,the speed is accelerated, and by lowering it retarded. To the upperextremity of the pendulum-spring (70) is attached a collet (70"), bymeans of a key, and by this collet the pendulum is suspended to the stud(Z); said spring (73) passes freely through the center of cylinder (f)and thence down to the collet (b") where it is attached, thus givingfree play for torsion to the spring. In line with the hook fork abovementioned, and attached to the pendulum Wire is placed the bob-catcher(m) the form of which resembles a heart, and which, at intervals of oneminute each, catches the bob by means of the hook fork till the impulsepin (9) is brought into the fork (p) and causes the bob to oscillateonce a minute; consequently the minute hand moves the dis tance of thespace marked on the face of the clock at once, instead of its gradualmotion as in other clocks.

The striking part consists of its main wheel (a) of 96 teeth, which isfurnished with click, click spring, ratchet, &c., similar to the mainwheel of the time part, opposite to which it is located. It works into apinion of 12 leaves, which is on the same arbor with the second wheel(0) of 72 teeth, which latter works again into a 10 leaf pinion (d) onthe same shaft or arbor with the third or scape wheel (0). This wheelhas 13 teeth and is acted upon by a recoil anchor (f) placed on an arbor(f) somewhat above and to one side of the center arbor (cl). On thisarbor (f) is an oscillating rack (g) extending upward having 18 teethworking into a 16 leaf pinion (h) on a vertical arbor On this arborsomewhat above the last named pinion are placed two hammers whichoscillate horizontally, and thus alternately striking a bell (70)designate the time. Near the upper edge of the back part of the frameand on the opposite side to the time work, there is an arbor (2) towhich are fastened the rack-detent-wire (Z), the countwheel detent wirem), and the discharge wire (11). Another arbor (0) is placed nearly on aline above the center arbor d) somewhat to the left of it and near thetop of the clock. To this arbor is fastened one extremity of thelift-wire (7)), the other extremity of which being acted upon by thelift pins on the second wheel (0), by means of which the time part andstriking part are connected together and vibrate the discharge balance(g) which is alsoattached to the arbor (0) the arms of this balance arebent downward so as to keep the weight below the center of the arbor,for the purpose of keeping them on a level or balance when at rest. Bythis arrangement it will be obvious that when the lift wire (2)) isacted on by the pin on the second wheel (0) it causes the dischargebalance to vibrate and lift the discharge wire (07,) and detent wire (l)which puts the striking part int-o operation. Back of the back plate ofthe clock, and on the same arbor with the second wheel (0), is placedthe count wheel (7) which has three divisions, so as to revolve onlyonce in 36 hours.

What we claim as our invent-ion and desire to secure by Letters Patentis,

1. In the time keeping part, first, the lift pins (15, more or less) onthe second wheel (0), by which the striking part is connected with thetime part; second, the counter balance to keep the bob (h) from fallingback of its own accord; third the hook-fork (7'), by means of which andthe bob catcher (12%), the bob (72,) is thrown out of the way of theupper collet f) of thependulum; and sixth, the manner or means by whichthe power. is communicated from the bob (It) to the pendulum to give itmotion, by the employment of the impulse pin (9) and crotch (79).

2. e claim, in the pendulum, constructing the weight in the mannerdescribed and the manner of regulating.

3. And we claim, in the striking part, first, the oscillating rack of 13teeth (more or less) extending upward and working into a pinion of 16leaves (more or less) on a vertical arbor with two hammers to which itgives an oscillating motion, so as alternately to strike a bell toindicate the hour; and second, the balance (9) which discharges thedetent wire (7%) in due time.

JOHN M. SHROCK. JOHN G. FISCHER.

Witnesses for Shrock:

RUBEN ANsEL, SAMUEL Horrono.

Witnesses for Fischer: DAVID REBEN, HENRY REGSLER.

